Coffee Break Training: Sprinkler Deflector Positions Under Obstructed Construction [open pdf - 178KB]
"Correct sprinkler placement is essential for heat collection and effective water discharge patterns. The sprinkler must be located close enough to the elevation where heat will accumulate, and positioned so when it operates the water spray is not impeded by the construction elements. It is important to note that sprinkler placement rules vary by the sprinkler type: standard spray, quick response, extended coverage, Early Suppression Fast Response (ESFR), etc. Always refer to the manufacturer's listing information and NFPA [National Fire Protection Association] 13, 'Installation of Sprinkler Systems', for specific guidance. Dimensions given are relative to the sprinkler's deflector position."
Coffee Break Training - Fire Protection Series No. FP-2006-46
United States Fire Administration: http://www.usfa.fema.gov/